Medical Dictionary


noun ri·so·ri·us \ri-ˈsōr-ē-əs, -ˈzr-\
plural -rii \-ē-ˌī\

Definition of RISORIUS

:  a narrow band of muscle fibers arising from the fascia over the masseter muscle, inserted into the tissues at the corner of the mouth, and acting to retract the angle of the mouth
March 31, 2015
refluent Hear it
Flowing back
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears